Let-off motion for looms



( N Model.)

M- LINSCOTT.

LET-OFF MOTION FOR LOOMS. No. 485,330. Patented Nov. 1, 1892.

UNITED STATES PATENT OFFICE.

JOHN M. LINSCOTT, OF WORCESTER, MASSACHUSETTS.

LET-OFF MOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 485,330, dated November 1, 1892.

Application filed January 28, 1890. Serial No. 338,844. (No model.)

To all whom it may concern.-

Be it known that I, JOHN M. LINSOOTT, a citizen of the United States, and a resident of Worcester, in the county of IVorcester and State of Massachusetts, have invented a new and useful Improvement in Let-Off Motions for Looms, of which the following is a specification, reference being had to the accompanying drawings, representing such portions of a loom as embody my invention, and which form a part of this specification.

Figure 1 represents a rear elevation of a portion of the loom, showing a part of the warp-beam and the connected mechanism by which the delivery of the Warp is regulated. Fig. 2 is a side elevation of the same portion. Fig. 3 is a top view thereof. Fig. 4 is a sectional view of the roll, to which a sliding motion is imparted in order to vary the speed of the Warp-beam. Fig. 5 is an elevation of the sliding roll, represented in Fig. 4: in sectional view.

Similar letters refer to similar parts in the different figures.

My invention relates to that portion of a loom known as the let-off, by which the warp is unwound or delivered from the warpbeam during the process of weaving; and it consists in the arrangement and construction of the operating parts, as hereinafter described, and specifically pointed out in the subjoined claims.

Referring to the accompanying drawings, A denotes a portion of the loom side or frame.

B is a portion of the beam upon which the warp is wound.

O is the whip-roll, over which the warp is carried to the harnesses in the usual manner.

D represents a worm-gear attached to the shaft D, to which the warp-beam B is also attached.

E is a vertical shaft journaled in suitable bearings in a framework F, which in the present instance is attached to the loom side A. Upon the vertical shaft E is a worm E and a ratchet-wheel E and immediately below the ratchet-wheel E is a disk E turning loosely on the shaft E and carrying the pawls a a a a, which are pivoted upon the disk E and engage the ratchet-wheel E From one side of the disk E a radial arm E extends, and with the radial arm E a band G is connected by means of a hook or clasp b, which is capable of sliding along the arm E. The band G is carried over the flanged guide-roll H and at tached at its opposite or lower end with the treadle I, pivoted at I to the end of an arm attached to the frame of the loom andhaving an angular motion imparted in one direction by the cam J upon the picking or lower shaft K of the loom. The cam J is a twoleaved cam, and at each revolution of the shaft K the lever or treadle I is depressed twice, imparting an angular motion to the radial arm E and disk E and through the pawls a to the ratchet-wheel E shaft E, and worm E, causing the warp-beam to turn and let off a portion of the warp wound thereon. As the cam J rotates, allowing the treadle to rise, the motion of the disk E and pawls a. are reversed by means of a spring L, which is attached to a rigid portion of the framework and also to a radial arm L, extending from the disk E the pawls in their reverse movement sliding over the teeth of the ratchet-wheel E At each pick of the loom, therefore, the treadle I is moved downward, causing an angular motion of the disk E and imparting an intermittent rotary motion to the worm E and warp-beam and letting off a portion of the warp, the warp-beam remaining at rest during the reverse movement of the disk E band G, and treadle I by means of the spring L.

A uniform movement of the worm E will cause a uniform angular movement of the warp-beam; but as the diameter of the warp upon the beam B is constantly decreasing it will be necessary to gradually increase the angular movement of the beam as the warp is unwound in order to secure a uniform delivery of the warp. In order to accomplish this purpose, I place the guide-roll H upon a sleeve M, which has a sliding motion upon a square shaft N, which is supported by .the frame F. Resting upon the warp on the beam B is a plate 0, from which a rod or standard 0 extends upward, moving in ways in the arms 0 c, projecting from the frame F. The upper end of the rod or standard is bent or carried forward, and attached thereto is the triangular frame P, the inclined or oblique edge P of which bears against the end of the sleeve M. As the warp is drawn from the beam, the plate 0, with its connected'stand ard and triangular frame P, is allowed tofall by its own weight, the oblique edge P gradually pushing the sleeve M along the square shaft N, carrying the guide-roll II, and with it the band G, thereby moving the hook or clasp b along upon the arm E and increasing the angular motion of the disk E and thereby imparting a greater movement to the worm E and warp-beam B, the increased angular movement of the warp beam B being arranged to compensate for the decreased diameter of the beam.

R denotes weights placed upon the rod or standard 0' to insure the falling of the plate 0 as the Warp is removed from the beam.

The triangular frame P consists of the upright bar 01 and the oblique bar 8, hinged at fto the upright bar and held in position by the slotted arc g and binding-screw h, allowing the angle of the oblique bar to be varied in order to vary the movement of the sliding sleeve M on the square shaft N.

The band G is attached to an eyebolt j, which is attached to the lever or treadle I, and the treadle I is provided with a row of holes is, allowing the distance between the eyebolt j and the cam J to be varied, thereby causing a variation in the angular motion of the disk E The ratchet-pawls a, a a a are arrangedwith unequal spaces between them, varying by the space of one-fourth of a tooth of the ratchet-Wheel, causing an angular motion of the disk equal to one-fourth of a tooth of the ratchetto move the ratchet.

Instead of the arrangement of pawls a a, placed at unequal distances apart, any of the usual and well-known forms of frictional connection may be employed between the disk E and the vertical shaft, by which the slightest motion of the disk E can be imparted to the shaft E. lVhen a full beam of warp is placed in the loom, the plate 0 is placed upon the surface of the warp, the hook or clasp b is placedat the outer end of the radial arm E and the eyeboltj is attached to the treadle I at such distance from the cam J'as to impart the requisite motion tothe band G and the radial arm E projecting from the disk E and the oblique edge P of the triangular frame P is made to bear against the sleeve M, so that as the plate 0 falls by the removal of the warp the edge P will cause the sleeve M and roll H to move on the square shaft N and push the hook or clasp I) along the radial arm E thereby increasing the angular motion of the disk E What I claim as of my invention, and desire to secure by Letters Patent, is

2. In a let off for looms, the combination, 7

with awarp-beam, of aworm-gear and a wormshaft, as described, by which said beam is turned, a disk provided with a radial arm and pivoted upon said shaft and operatively connected therewith, substantially as described, a vibrating treadle, a cam actuating said treadle, a band connecting said treadle and said radial arm, and a flanged guide-pulley, over which said band passes, said guide pulley or roll having a sliding motion, whereby the position of said'band is changed relatively to said radial arm, substantially as described.

3. I11 a let-0E for looms, the combination, with the disk E provided with a radial arm E of a band G, connecting said arm with a vibrating lever or treadle, a vibrating treadle, and an actuating-cam, a flanged guide-roll having a sliding motion by which the position of said band is changed relatively to said radial arm and the angular motion of said disk is varied, and an oblique bar supported by'the' warp upon the warp-beam and operating to slide said roll as the oblique bar is allowed to fall by the removal of the warp from the warp-beam, substantially as described.

4. In a let-off for looms, the combination, with the warp-beam, of a worm-gear D, a worm-shaft E, provided with a worm E, ratchet-wheel E disk E carrying pawls aa a a and provided with a radial arm E treadle I, cam J, connecting-band G, connecting said treadle with said radial arm and adj ustably attached to said treadle, a flanged guide-roll" IIC 

